Dental apparatus



June 23, 1925. 1,543,545 I E. M. BOATNER DENTAL APPARATUS Filed April 10, 1924 Patented June 23, 1925.

EDWARD'M. BOATNER, OF SAN ANTONIO, TEXAS.

DENTAL APPARATUS.

Application filed April 10, 1924. Serial No. 705,690.

To all wkpm it may concern:

Be it known that I, EDWARD M. BOATNER, a resident of San Antonio, in the county of Bexar and State of Texas, a citizen of the United States, have invented certain new and useful Improvements in Dental Apparatus, of which the following is a specification.

My invention relates to improvements in dental apparatus, and refers particularly to an apparatus or appliance to be used for heating the investment used by dentists in casting false teeth crown and bridge work inlays, etc.

The main object of my invention is the provision of an apparatus or appliance which will utilize electricity as the heat supplying medium and which will be capable of use in connection with the usual plug and socket connections, or which may employ a regulating switch or which can be used with a rheostat and which in any situation will operate in an efficient and reliable manner.

Another object of my invention is the provision of an apparatus of the character and for the purpose stated which will be capable of regulating the degree of heat required in a most satisfactory manner to obtain the highest degree of efiiciency.

Another object of my invention is the provision of an apparatus for the use of den-' tists which will prove a decided improvement over the apparatus in present use and which while obtaining the best possible results will be of compact size; strong and durable to withstand hard service; inexpensive of production and in all respects efficient and practical.

With these objects in view my invention consists of a dental apparatus embodying novel features of construction and combination of arts, substantially as described and defined liy the claims and as shown in the accompanying drawing, in which Figure 1 represents a top plan view of the complete dental apparatus constructed in accordance with my invention.

Figure 2 represents a horizontal sectional view.

Figure 3 represents a side elevation of the complete apparatus.

Figure 4 represents a sectional view on the line 44 of Figure 1, and

Figure 5 represents a vertical central sectional view of the form of my apparatus adapted for use in connection with a switch and connections for regulating the heat supply.

I have stated that my apparatus is for dental purposes and while it is highly desirable for such service I would have it understood that it may be used in other situations and would perform its functions in a practical manner.

In accordance with my invention the apparatus consists of a tubular or cylindrical element 1, of the proper size and of the best suited material and which is formed with the inward extending flange 2, which forms a support for the model or casting or other object to be heated, and also having the lower outward extending flange 3, provided with threads 4, while at its upper outer edge are provided threads 5, the said threads 4 and 5 receiving the threads 6, on the enclosing shell or casing 7, thus forming a heating coil receiving space or chamber 8, and being closed at the top by the threaded cap ring 9, as most clearly shown in Figures 4 and 5.

It will thus be seen that my apparatus is in the form of a ring or open element in which is received and enclosed the model or casting and that in the space or chamber 8, is received the heating coils 10, of the proper character for the purpose and whose connections 11, pass through the slot 13, in the shell or casing 7 to the binding posts 12, which are adjustably supported in the frame 14, by means of the nuts 15, disposed on each side of said frame, and the other ends 16 of said posts or connections extendbeyond the frame and are adapted to be connected in circuit by the wires 17 and 18, with the battery 19 and the switch 20, by means of which the desired amount of electricity may be supplied to the coils for properly heating the element in which the model or casting is placed.

- In the form of my apparatus shown in Figures 3 and 4 three postsor extensions 21, are provided and this form is designed for use in connection with the usual plug, and allows three different degrees of heat to be supplied by adapting the plug to the desired extensions 21, as will be readily understood from the drawing and description.

I have shown my apparatus for use with a switch or plug but it willbe understood that it may be connected for service in any manner and also that any of the well known timing devices may be used if desired in connection with my apparatus.

hen the apparatus is used by dentists in casting false teeth and bridge work the investment is placed in the ring or element and subjected to the desired amount of electric heat and its operation insures a rapid, even and most satisfactory result and provides a most simple, inexpensive and convenient apparatus for the desired purpose.

I claim:

1. An apparatus of the character and for the purpose described, consisting of an enclosing element having an open and closed portion, a ring connected to said open portion of the element to form a coil receiving chamber, coils arranged in said chamber and 20 having their terminals passing out from the ring, binding posts connected with said terminals and having extensions for connection with a plug or switch.

2. An apparatus of the character and for the purpose described consisting of a tubular enclosing element, having an open and closed portion, said closed portion forming a support, a ring connected to said open end of the element in spaced relation to form a chamber, said ring having a slot at one side, coils arranged in said chamber and having their terminals passing out through said slot, a frame connected to said ring, and binding posts mounted in said frame having' their inner ends connected with the terminals of said coils and their outer ends adapted for connection with a plug or switch.

In testii'non whereof I hereunto affix my signature.

EDVARD M. BOATNER, DDS. 

